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Title: Property analysis and mathematical modeling of machining properties of aluminium alloy hybrid (Al-alloy/SiC/flyash) composites produced by liquid metallurgy and powder metallurgy techniques
Authors: Charles, S
Arunachalam, V P
Issue Date: Dec-2004
Publisher: CSIR
IPC Code: C22C 49/06
Abstract: Aluminium hybrid composites reinforced with silicon carbide and flyash particulates were fabricated by stir casting and powder metallurgy methods. Different volume fractions of SiC particles (10, 15 and 20 vol%) and constant volume fraction of flyash (10 vol%) were used for the synthesis. Wear, micro hardness, tensile and microstructural properties were studied. Results of the investigations indicated that wear resistance and hardness were enhanced on increasing the vol% of SiC. The tensile strength was high at 10 vol% of SiC and it decreased as the vol% increased. Microstructure showed a fairly uniform distribution of the dispersoids. Electric discharge machining was done on the composite specimens and mathematical models were developed for predicting the material removal rate and tool wear rate using design of experimentation with current, pulse duration and vol% of SiC as the process variables. Curves describing the direct and interaction effect of the process variables were drawn. It was found that the material removal rate and tool wear rate increased with increase in current and decreased with increase in pulse duration and vol% of SiC. The behaviour of the composites was similar both for powder metallurgy and stir casting, except the fact that stir cast specimens exhibited higher hardness, wear resistance and tensile strength. This increase can be attributed to the close interfacial bonding of stir cast specimens.
Page(s): 473-480
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.11(6) [December 2004]

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